I'm running Cross DJ on a Samsung Galaxy S7 edge, version 7.0 Android using the OTG USB connector supplied.. In the Developer options i changed the USB Configuration setting to MIDI. I connected the S7 edge to a powered USB hub via USB cable and connected the Numark DJ2GO 2 to the hub. I opened Cross DJ and then switched on the hub. I got a "USB Connection Failure - controller not supported" message. Also tried it without the hub, but same result.

By all accounts this should work. So my question is, what am i missing?